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Long-Term Debt - Scheduled Principal Payments on Long-Term Debt (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]  
2020 $ 1,010
2021 2,263
2022 3,707
2023 522
2024 3
All subsequent years 4,943
Key [Member]  
Debt Instrument [Line Items]  
2020 0
2021 998
2022 1,342
2023 0
2024 0
All subsequent years 2,578
Subsidiaries [Member]  
Debt Instrument [Line Items]  
2020 1,010
2021 1,265
2022 2,365
2023 522
2024 3
All subsequent years $ 2,365